Malicious PDF — malware analysis report

Static analysis result for SHA-256 84acda0832611c15…

MALICIOUS

PDF

70.3 KB Created: 2020-08-09 22:33:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3078cc8a604f5f1778231ae8b8e67fb1 SHA-1: 58f8c9c9b4966a6ca84165e37c10661bb8f6079f SHA-256: 84acda0832611c156b2650fe01777f69ec5ef304afcef9aaf2b56785119c3ee5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation. One prominent link, 'https://ttraff.cc/pify?keyword=fundamentals+of+algorithmics+solutions+manual+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, indicating an attempt to lure users to malicious infrastructure under the guise of providing a solutions manual.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=fundamentals+of+algorithmics+solutions+manual+pdf
    • http://kivev.geierbrainlab.com/uploads/1/3/0/9/130969723/vixoxikerape_xetuxe_falafigobujeton.pdf
    • http://files.buildingourtomorrow.org/uploads/1/3/1/0/131070137/nifesitukoxekezogev.pdf
    • http://files.bloodrock100.com/uploads/1/3/1/3/131381946/5179d05ffae8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0447/5686/1077/files/usps._com_move_to_change_your_address.pdf
    • https://cdn.shopify.com/s/files/1/0434/4519/0821/files/zuzemizupigeleriwuto.pdf
    • https://cdn.shopify.com/s/files/1/0428/7106/2684/files/gambler_s_ruin_problem.pdf
    • https://cdn.shopify.com/s/files/1/0435/0862/9659/files/noxudusonemonowi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2956/0486/files/26816279919.pdf
    • https://cdn.shopify.com/s/files/1/0427/4041/6678/files/base64_encode_js.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/sonetobapafileniponedan.pdf
    • https://cdn.shopify.com/s/files/1/0441/2299/6888/files/51236434624.pdf
    • https://cdn.shopify.com/s/files/1/0431/9684/2142/files/45786859943.pdf
    • https://cdn.shopify.com/s/files/1/0427/4959/1718/files/at_t_refurbished_iphone.pdf
    • https://cdn.shopify.com/s/files/1/0433/1261/1481/files/buscopan_simples_gotas_bula.pdf
    • https://cdn.shopify.com/s/files/1/0430/0118/4417/files/reverse_inflation_calculator.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009941.bin
3f3a4681490950f0abadb99ced47504c5cddd3da229a5c021cf95263504330c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9941 11548 bytes
font_01_sfnt_off0000bf32.bin
e7d176f5e6e942584c12a6555433d088fe8556858c4815b3abc387a3e05c9a9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF32 5408 bytes
font_02_sfnt_off0000d16a.bin
12998502ab4609bf5f7e7bdb38173dd90d60b2c57a44e33484fb8286db1bf6c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD16A 13720 bytes
font_03_sfnt_off0000fd99.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD99 4324 bytes

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